Questions in st-line

Select	Question
	The obtuse angle between the lines $y=-\ 2$ and $y=x+2$ is
	The line passes through $(1, 0)$ and $(-\ 2,\ \sqrt{3})$ makes an angle of ______ with x–axis
	Angle between $x=2$ and $x-3y=6$ is
	If the lines $y=(2+\sqrt{3})x+4$ and $y=kx+6$ are inclined at an angle ${{60}^{o}}$ to each other, then the value of k will be
	A straight line $(\sqrt{3}-1)x=(\sqrt{3}+1)y$ makes an angle ${{75}^{o}}$ with another straight line which passes through origin. Then the equation of the line is
	The angle between the lines ${{a}_{1}}x+{{b}_{1}}y+{{c}_{1}}=0$ and ${{a}_{2}}x+{{b}_{2}}y+{{c}_{2}}=0,$ is
	The inclination of the straight line passing through the point (–3, 6) and the midpoint of the line joining the point (4, –5) and (–2, 9) is
	The angle between the lines $2x-y+3=0$ and $x+2y+3=0$ is
	The angle between the straight lines $x-y\sqrt{3}=5$ and $\sqrt{3x}+y=7$ is
	Angle between the lines $2x-y-15=0$ and $3x+y+4=0$ is